#!/usr/bin/perl
#
# Copyright (c) 2025 NVI, Inc.
#
# This file is part of VLBI Field System
# (see http://github.com/nvi-inc/fs).
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#

open(HOSTS, "/etc/hosts") or die "Cannot open /etc/hosts: $!";
   while (<HOSTS>) {
    if (/^(\d{1,3}(?:\.\d{1,3}){3})\s+(\S+)/) {
      $hosts{$1} = $2;
    }
   }
close(HOSTS);

while (<>) {
 foreach $ip (keys %hosts) {
   $cname = $hosts{$ip};
   $cname = substr($cname . (" " x 15), 0, 15);
   $ip = substr($ip . (" " x 15), 0, 15);
   s/\Q$ip\E/$cname/g;
  }
  print;
}
